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12-09-2011, 11:00 AM
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#1 |
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Registered User
 
Join Date: Oct 2007
Location: Marietta, GA
Posts: 805
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Heater Blower - 64 C10
The blower fan on my 64 now works only on the highest speed. The motor was replaced a few years ago, and is still quiet and seems to function normally...but only on the highest speed. Is this likely a problem with the blower motor, or could it be the switch? Or something else?
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12-09-2011, 11:20 AM
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#2 |
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Registered User
Join Date: Nov 2011
Location: fayetteville nc
Posts: 10,338
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Re: Heater Blower - 64 C10
I think its your heater switch on the dash. That controls the speed of the blower motor.
__________________
1963 Short bed step side SBW 427 big block and borg warner T-16 HD 3 speed manual http://67-72chevytrucks.com/vboard/s...d.php?t=519869 1963 Short bed fleetside BBW 348 1st gen big block w/Powerglide http://67-72chevytrucks.com/vboard/s...d.php?t=619024 1964 Short bed trailer |
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12-09-2011, 12:48 PM
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#3 |
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Registered User
Join Date: Dec 2011
Location: EL Mirage , Az
Posts: 55
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Re: Heater Blower - 64 C10
Do these trucks have blower motor resistor's that are seperate from the switch? If so I would think it's your resistor. If one is bad it send's full power to motor only allowing the highest setting to be used. Atleast that's what I replace all the time on most cars with the same symptons.
Good luck |
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12-09-2011, 03:11 PM
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#4 |
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Registered User
Join Date: Nov 2011
Location: fayetteville nc
Posts: 10,338
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Re: Heater Blower - 64 C10
Yes, the resistor mounts on the heater box inside the cab, should glow red when hot.
__________________
1963 Short bed step side SBW 427 big block and borg warner T-16 HD 3 speed manual http://67-72chevytrucks.com/vboard/s...d.php?t=519869 1963 Short bed fleetside BBW 348 1st gen big block w/Powerglide http://67-72chevytrucks.com/vboard/s...d.php?t=619024 1964 Short bed trailer |
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12-12-2011, 02:53 PM
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#5 |
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Registered User
Join Date: Oct 2007
Location: Marietta, GA
Posts: 805
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Re: Heater Blower - 64 C10
This is helpful guys, thanks.
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12-12-2011, 07:00 PM
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#6 | |
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Senior Member
Join Date: Feb 2010
Location: Lambertville, MI
Posts: 1,865
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Re: Heater Blower - 64 C10
Quote:
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12-12-2011, 10:13 PM
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#7 |
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Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: Heater Blower - 64 C10
The resistor mounts on the back (firewall side) of the heater ducting. That is most likely what is causing your problem. When the resistor fails, high speed works but slower speeds do not, since power flowing through the resistor is what slows down the fan motor. If you follow the wire loom to the back of the ducting, you should be able to "feel" your way around to unplug the harness from the resistor, and then pop the resistor out of the ducting. It just snaps in place.
It appears however that most of the aftermarket suppliers are only selling the later version which is attached with screws. This may require either modification to fit the spring retainers, or installing it with screws. Here's a schematic showing where it goes: 
Last edited by markeb01; 12-12-2011 at 10:22 PM. |
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12-13-2011, 02:33 PM
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#8 |
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Registered User
Join Date: Oct 2007
Location: Marietta, GA
Posts: 805
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Re: Heater Blower - 64 C10
That is really helpful, thanks!
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09-07-2012, 12:40 AM
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#9 |
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But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: Heater Blower - 64 C10
My resistor on my 66 fell apart.
Classic Parts has them for sale: http://www.classicparts.com/1960-72-...ctinfo/68-375/ 
__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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